Parsing library for Python?

[Viktor Rosenfeld]

Hi, 

I need to create a parser for a Python project, and I'd like to use process
kinda like lex/yacc.  I've looked at various parsing packages online, but
didn't find anything useful for me:

- PyLR seems promising but is for Python 1.5
- Yappy seems promising, but I couldn't get it to work.  It doesn't even
compile the main example in it's documentation
- mxTexttools is way complicated.  I'd like something that I can give a BNF
grammar to handle.

Is there a good parsing module for python that I missed?

TIA,
Viktor